[PSUBS-MAILIST] Commercial Grade O2 vs. Medical

[Steve McQueen via Personal_Submersibles]

I tried to search the archives but it wasn't very friendly.  Sorry to again ask about something I know has probably been discussed.

I wanted to double ck. my O2 strategy.  After some investigation it seems I will buy a new steel high pressure oxygen tank for external mounting. My plan is to have it refilled with "commercial grade" O2 vs. medical grade 02.  As long as I keep my "personal" tank and not allow the filler to swap tanks I should create a "chain of custody" that will help me feel good about not having contamination.

I am wondering how others are managing.

Thanks,
Steve